moriwaki cams and rear linkage - Honda RC51 Forum : RC51 Motorcycle Forums
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post #1 of 61 (permalink) Old 02-09-2011, 02:17 PM Thread Starter
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moriwaki cams and rear linkage

ok, have the oppurtunity to buy some moriwaki stage 1 cams. I've never done cams on a bike before, anyone have any experiences with this and what kind of gains and/or issues that could come up? will reliability be severly degraded? is this only recommended for bikes with big bore kits or BIG engine mods? how is the powerband affected?my bike is equipped with turnone snorkel/airbox, pc III, Ethos design exhaust
, and scotts ignition coil stick conversion.

Also is there any difference between the moriwaki rear suspension linkage and the Dan Kyle ones? seem like Dan's are a lot cheaper but i have not heard of any differences between the two.

Thanks for the help guys.

2001 Honda RC51 SP1
1996 Honda CBR 900RR
2003 Aprilia RSV Mille R
1999 Aprilia RS50
2012 Triumph Daytona 675R (Sold)
2010 BMW S1000RR (Sold)
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post #2 of 61 (permalink) Old 02-09-2011, 02:50 PM
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The Stage 1 cams have a bit more lift and duration than the OEM cams, and are milder than the Stage 2 cams.
You would see a bit more power mostly at the upper RPM range.
They should work well with aftermarket full exhaust and airbox.
Reliability should be ok since your bike will still have the OEM hard rev limit and not the higher rev limit of the HRC ECU.
I don't have the exact specs on the Moriwaki cams (lift/duration) since these cams were discontinued and are hard to find.

I have seen photos of the Moriwaki link and it matches the Kyle link, who copied the dimensions from the Moriwaki link.
The HRC link has the same dimensions as the Moriwaki link, but requires an eyelet lower shock mount vs the clevis mount the OEM and aftermarket shocks use.

From what I understand, you'll need to change out the springs, seats, and possibly the retainers to use the cams.
The springs are a different wind that allows the buckets to travel farther down the bore for the extra cam lift without binding. The seats also work with the springs in this as well.
The retainers are there for less reciprocating weight at the higher lifts and also fit the different inner and outer diameters of the inner and outer springs.

The bad news is that these HRC parts (springs, seats, retainers) have been discontinued.
I ordered my set last year just before they discontinued them.
Try contacting Rising Sun Cycle to see if they still have a set of springs, seats, and retainers.
Here are the HRC part numbers and prices from last year.

14750-NL6-000 HRC Double Valve Spring $11.10 ea. (qty 8 req'd)
14775-NL6-000 HRC Valve Spring Seat Outer $24.60 ea. (qty 8 req'd)
14776-NL6-000 HRC Valve Spring Seat Inner $32.70 ea. (qty 8 req'd)

I obtained a special set of titanium retainers so, I didn't price or order the HRC aluminum items.

If you decide not to use the cams, I may be interested in them.

Last edited by SubSailor; 02-09-2011 at 03:17 PM.
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post #3 of 61 (permalink) Old 02-09-2011, 04:24 PM
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This is a pretty good thread: Cam Options

The DK and Mori link (and mine) are extremely similar... wink-wink, nudge, nudge.
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post #4 of 61 (permalink) Old 02-09-2011, 05:28 PM Thread Starter
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Awesome thanks for the info guys.

subsailor, i think i'm going to give them a try. i will ask the seller if he has any extra sets, or if i decide not to do it i will let you know right away. From what i've read in other threads on speedzilla is moriwaki makes some springs and im sure retainers and seats as well. question is are they available anywhere. I may contact simon percival on this as well and see if he can locate anything for me. I'm sure i will have more questions on this for you so expect to see some Pm's if thats ok. I don't know anyone else running different cams. i will keep you updated and let you know what info i pick up.

Ben, do you have pics and prices? can i find them on your site? you know i'd be happy to buy from you if they are the same.

2001 Honda RC51 SP1
1996 Honda CBR 900RR
2003 Aprilia RSV Mille R
1999 Aprilia RS50
2012 Triumph Daytona 675R (Sold)
2010 BMW S1000RR (Sold)
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post #5 of 61 (permalink) Old 02-09-2011, 07:56 PM
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are the cams for SP1 only right?
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post #6 of 61 (permalink) Old 02-09-2011, 09:14 PM
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Originally Posted by cbrbear View Post
are the cams for SP1 only right?
Should be for both SP1 or SP2.
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post #7 of 61 (permalink) Old 02-10-2011, 03:05 AM Thread Starter
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they are listed as SP1. Well, so far this is what i've found. According to mick hone, moriwaki distributor, the stage 1 cams use all the stock parts. The lift is the same but duration is changed. A few people on speedzilla have stated the same. i guess i could see this as being true seeing that the lift is unchanged. what do you think subsailor?

2001 Honda RC51 SP1
1996 Honda CBR 900RR
2003 Aprilia RSV Mille R
1999 Aprilia RS50
2012 Triumph Daytona 675R (Sold)
2010 BMW S1000RR (Sold)
2005 Yamaha R6 (Sold)
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post #8 of 61 (permalink) Old 02-10-2011, 08:17 AM
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I don't see why the cams would be different between SP1 and SP2, at least in fitment.
If I had to guess (and I've found this with some other items on RC51s), the fitment and catalog information wasn't updated when the items were made. So when the first RC51s rolled around the world in 1999/2000/2001 and the aftermarket started producing parts, they were for the SP1... around, say, 2002/2003 the wind was being let out of the sails and the aftermarket may have slowed production of some parts, and never updated catalogs/fitment guides, so they may still just say SP1. But that can also be a long-shot.

For the rear link, this link should work. If not, they are avail in silver and black, $235 plus shipping (figure $8 to $10 if going in the US).

And PM sent on something related...
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post #9 of 61 (permalink) Old 02-10-2011, 09:08 AM Thread Starter
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thanks Ben, PM sent

2001 Honda RC51 SP1
1996 Honda CBR 900RR
2003 Aprilia RSV Mille R
1999 Aprilia RS50
2012 Triumph Daytona 675R (Sold)
2010 BMW S1000RR (Sold)
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post #10 of 61 (permalink) Old 02-10-2011, 01:12 PM
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they list SP1 as they stopped makiing them b4 the SP2
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